[Solved] CSVReader headerReader = new CSVReader(new FileReader(this.getClass().getResource(filePath).getPath()), delimiter);

by

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CSVReader headerReader = new CSVReader(new FileReader(this.getClass().getResource(filePath).getPath()), delimiter);

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solved CSVReader headerReader = new CSVReader(new FileReader(this.getClass().getResource(filePath).getPath()), delimiter);